Does chip amp power depend on its input voltage?

tjesh

Thread Starter
Joined
Aug 28, 2006
Messages
84
I am about to build my first chip amp per an article in the IEEE Spectrum
from 10/31/18 by Glenn Zorpette. This is based on the 3e Audio (Ali Express)
EAUMT-0050-2-A utilizing a TPA 3250 amp chip.

I have gathered the following as per the article:
Xkitz Electronics XAPS-500W power supply.
AnTek Products AS-2222 transformer. 22 Volts, 200 Watts.

However, upon trying to buy the said EAUMT-0050-2-A board, I found that it
was since obsoleted and replaced by the TPA 3255 chip. Sure
enough, the new board has become: EAUMT-260-2-B. Still, "No
problemo", I thought.

Eventually, I discovered that the 3250 is slightly undervolted at 22 v, and
was rated at 50 watts sustained (100 watts peak), whereas the
the 3255 "update" likes higher voltage but is rated at 100 watts
sustained (200 watts peak). Some update.

Query:
1. Is the power output for a TPA chip amp dependent on the input
voltage from its power supply?

2. How come such a wide input range (24-51) can be specified?

3. Is 44 volts overkill for the updated chip to achieve 100w rms?

As you see, Mr. Zorpette had begun with a transformer already outputting
just below the minimum suggested value for the TPA 3250. (24v) Hmmmm.
I believe he more than knows what he is doing.

Any help appreciated. Maybe someone has already fried a 3250. 8-/

tj

BTW, the object of this madness: an SPK5 cabinet from Purifi plans to
evaluate a Purifi Audio PTT6.5W08-01B 6.5" Woofer - 8 ohm which
has unbelievable specs re extension and distortion. See for myself.

A REALLY long time ago, Goodmans in England offered an Axiom 80 (I
believe it was), an 8" full-range driver that could actually produce
20 cps thanks to an exotic, free-edge suspension system according to
Wharfedale's founder, G.A. Briggs. It played softly, of course,
and the expensive-for-the-time units were offered in a complete,
large cabinet employing four Axiom 80s. Out of my league. 8-(

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Couriant

James
Moderator
Joined
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Messages
38,779
I have moved this thread to the DIY section as this is not computer specific related, and hopefully you get a better response.
 

tjesh

Thread Starter
Joined
Aug 28, 2006
Messages
84
Couriant, maybe you can help me. Where in blazes is the SEND button in order to post the question? I was successful but pressed every damn button I could find, including the intro to the side. :cool:
 

Couriant

James
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Joined
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Messages
38,779
What you mean by that? You were able to create the thread, and reply, so I am not sure what you mean.
 

tjesh

Thread Starter
Joined
Aug 28, 2006
Messages
84
How did I reply? I wrote, previewed, then used taginfo, then, not seeing a send button, pressed preview a few more time, then went to the front page of techguy, and when I gave up and returned here, LO, the message posted itself.
 

Couriant

James
Moderator
Joined
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Post Thread or Reply would be the option. Some times depending on the thread there may be some keywords that may trigger spam filter so the thread will need to be reviewed.
 

tjesh

Thread Starter
Joined
Aug 28, 2006
Messages
84
Thank you. I saved your response for the next time. I haven't been here for a while, and I was looking for "Send". I'll bet there is/was a
key to Post reply which I ignored since I didn't think I was replying.
:cool:
 

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